Lady Colin Campbell has hit back at critics who branded her new book containing claims about the Queen's sex life 'tawdry' and 'unnecessary'.

In her book The Queen's Marriage, Lady Colin, 68, a socialite and former I'm a Celebrity contestant, makes sensational allusions to Her Majesty's 'healthy sexual appetite', and refers to her husband the Duke of Edinburgh as a 'flirt'.

The author, who was married to the Duke of Argyll’s son Lord Colin Campbell for 14 months, spoke out on Loose Women and denied suggestions her book was full of falsehoods.

She said that while the details contained in her book aren't common knowledge, they were just that in 'a certain circle'.

Lady Colin also denied suggestions the topic of the Queen and the Duke's intimate life was inappropriate, because 'it's a state marriage'.

Lady Colin Campbell has hit back at critics who have slammed her book which caused outrage with comments

The Jamaican-born socialite claimed that the Queen has a 'healthy sexual appetite' and her husband was a 'flirt'

The book The Queen's Marriage uses a variety of sources who Lady Colin claims know intimate details about the monarch

Referring to her claims about The Queen's wedding night she insisted sources close to Prince Philip had told her the lurid details.

‘Because Prince Phillip told his first cousin Lord David Milford Haven,' she said when pressed on how she would know.

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‘It is not common knowledge - it’s knowledge within a certain circle. I’ve known people who’ve known him all his life and... pretty much lived with him etc.'

Snapping back at suggestions it is inappropriate to discuss the monarch's intimate relationship, Lady Colin said: 'Of course its appropriate darling we’re speaking about a state marriage.

'We’re speaking about a marriage that has been trashed by The Crown [the Netflix show] and all sorts of tabloids, saying Prince Philip was a lothario and I’m showing that they had a happy solid and firm marriage.

‘It’s perfectly okay for people to tell lies about them, but I don’t know why it’s not okay for me to speak the truth about them.'

Lady Colin Campbell defended her tome insisting that it wasn't lies and that she only spoke the truth

The socialite explained that she wanted to humanise the royal couple and speak of their long history

Lady Colin wrote the book using a variety of sources, and previously said: 'Many of the most penetrating insights and information in this book were provided by people who had no idea, as they were providing them, that one day their comments would see the light of day in a written work.’

She told the ITV panel that she wanted to write a book that was 'intelligent', and said the Queen and Prince Philip were simply 'human beings', who happened to have affected millions of people's lives.

'I wanted to write a book that was intelligent, that would show people where the Queen and Phillip came from and what shaped them - where they wanted to go in their public roles.

‘Their lives have had an impact on hundreds of millions of people and most people don’t really understand who they are as human beings, I wanted to show through their history and personal lives what they have accomplished.'

Lady Colin told the Loose Women that she 'just ignored' any criticism saying: 'I will write whatever I want, and I will only ever write the truth and they know that.'

Unfortunately Lady Colin's book has been blasted by royalists who have called it 'distasteful'

The former I'm A Celebrity contestant appeared on Loose Women to speak about her controversial book

Many royalists jumped to the Queen's defence over the claims made in the book, with former royal butler Paul Burrell telling the Mirror: 'Anyone can make up these claims. You can only be a true, ­reliable witness to history if you are there.

'Lady Colin Campbell was none of those things. She is writing about our Head of State, our Head of Church and someone who she does not know. She is writing about someone who she is not familiar with.

'I stood beside her and lived with her for 11 years and I can tell you who the Queen is. She is a good, kind Christian lady and she should not be defiled in this way because she is above that.

'She has earned our respect as a nation and things like that should not be written.'

He was backed by Former BBC Royal ­Correspondent Jennie Bond, who said: 'I don't see any need to discuss the Queen's love life and marriage.

'It's distasteful, unnecessary and tawdry.'

And the Queen's former press secretary, Dickie Arbiter, said: 'I will not dignify anything Lady Colin Campbell writes or says with a comment.'